i just bought my son a couple of radioshack 7-segment red led 0.3" digital displays.. (since we are awaiting different ones to come in that we bought on ebay.. the pins are different). i haven't found any real tutorials on these, and i have come across other people having the same issue..

How are you planning to use it - multiplex by driving 1 anode High at a time while the common cathodes are connected to each other with a series resistor to Gnd?Or by driving all anodes at once each with their own series resistor, with the 2 common cathodes connected to Gnd?

ok, keep in mind we are new to arduino and all this.. so we don't understand as much as you guys..

does each pin require a resistor? if so, which?

i thought this thing was going to be fun, so i bought the arduino for my son and a bunch of misc parts on ebay.. so we don't have everything we need, but slowly getting it and getting the parts we need.

so please be patient... i don't want every post i make to turn into an argument with people on here...

if there is a schematic for the exact one we have, we would like to see it... we never wired up a digit led before. we just don't get it atm

#14 is connected to pin 7 #13 is connected to pin 6#8 is connected to pin 4#7 is connected to pin 2#6 is connected to pin 1#1 is connected to pin 9#2 is connected to pin 10# 12 & 4 are connected to ground on bread board#9 is not connected at all

resistors are connected to ground on breadboard to their digit led pin wire.. using 5x 220 and 4x 680 because i don't have anymore 220's